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Category:   Application (Web Server/CGI)  >   Squid Vendors:   Squid-cache.org
(Red Hat Issues Fix) Squid HTTP Response Processing Bug Lets Remote Users Cause Denial of Service Conditions
SecurityTracker Alert ID:  1037215
SecurityTracker URL:  http://securitytracker.com/id/1037215
CVE Reference:   CVE-2016-3948   (Links to External Site)
Date:  Nov 4 2016
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 3.0 - 3.5.15, 4.0 - 4.0.7
Description:   A vulnerability was reported in Squid. A remote user can cause denial of service conditions on the target system.

A remote user can send specially crafted HTTP responses to trigger a bounds checking flaw and deny service to all clients connected to the Squid service.

Santiago R. Rincon of Debian reported this vulnerability.

Impact:   A remote user can cause denial of service conditions on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2016-2600.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2016-2600.html (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  7

Message History:   This archive entry is a follow-up to the message listed below.
Apr 4 2016 Squid HTTP Response Processing Bug Lets Remote Users Cause Denial of Service Conditions



 Source Message Contents

Subject:  [RHSA-2016:2600-02] Moderate: squid security, bug fix, and enhancement update

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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: squid security, bug fix, and enhancement update
Advisory ID:       RHSA-2016:2600-02
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2016-2600.html
Issue date:        2016-11-03
CVE Names:         CVE-2016-2569 CVE-2016-2570 CVE-2016-2571 
                   CVE-2016-2572 CVE-2016-3948 
=====================================================================

1. Summary:

An update for squid is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Server (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

3. Description:

Squid is a high-performance proxy caching server for web clients,
supporting FTP, Gopher, and HTTP data objects.

The following packages have been upgraded to a newer upstream version:
squid (3.5.20). (BZ#1273942, BZ#1349775)

Security Fix(es):

* Incorrect boundary checks were found in the way squid handled headers in
HTTP responses, which could lead to an assertion failure. A malicious HTTP
server could use this flaw to crash squid using a specially crafted HTTP
response. (CVE-2016-2569, CVE-2016-2570)

* It was found that squid did not properly handle errors when failing to
parse an HTTP response, possibly leading to an assertion failure. A
malicious HTTP server could use this flaw to crash squid using a specially
crafted HTTP response. (CVE-2016-2571, CVE-2016-2572)

* An incorrect boundary check was found in the way squid handled the Vary
header in HTTP responses, which could lead to an assertion failure. A
malicious HTTP server could use this flaw to crash squid using a specially
crafted HTTP response. (CVE-2016-3948)

Additional Changes:

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 7.3 Release Notes linked from the References section.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

After installing this update, the squid service will be restarted
automatically.

5. Bugs fixed (https://bugzilla.redhat.com/):

1254016 - IPv4 fallback is not working when connecting to a dualstack host with non-functional IPv6
1254018 - should BuildRequire: g++
1299972 - squid file descriptor limit hardcoded to 16384 via compile option in spec file
1312257 - CVE-2016-2569 CVE-2016-2570 squid: some code paths fail to check bounds in string object
1312262 - CVE-2016-2571 CVE-2016-2572 squid: wrong error handling for malformed HTTP responses
1323594 - CVE-2016-3948 squid: denial of service issue in HTTP response processing
1330186 - digest doesn't properly work with squid 3.3 on CentOS 7
1336940 - Disable squid systemd unit start/stop timeouts

6. Package List:

Red Hat Enterprise Linux Server (v. 7):

Source:
squid-3.5.20-2.el7.src.rpm

aarch64:
squid-3.5.20-2.el7.aarch64.rpm
squid-debuginfo-3.5.20-2.el7.aarch64.rpm
squid-migration-script-3.5.20-2.el7.aarch64.rpm

ppc64:
squid-3.5.20-2.el7.ppc64.rpm
squid-debuginfo-3.5.20-2.el7.ppc64.rpm
squid-migration-script-3.5.20-2.el7.ppc64.rpm

ppc64le:
squid-3.5.20-2.el7.ppc64le.rpm
squid-debuginfo-3.5.20-2.el7.ppc64le.rpm
squid-migration-script-3.5.20-2.el7.ppc64le.rpm

s390x:
squid-3.5.20-2.el7.s390x.rpm
squid-debuginfo-3.5.20-2.el7.s390x.rpm
squid-migration-script-3.5.20-2.el7.s390x.rpm

x86_64:
squid-3.5.20-2.el7.x86_64.rpm
squid-debuginfo-3.5.20-2.el7.x86_64.rpm
squid-migration-script-3.5.20-2.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

aarch64:
squid-debuginfo-3.5.20-2.el7.aarch64.rpm
squid-sysvinit-3.5.20-2.el7.aarch64.rpm

ppc64:
squid-debuginfo-3.5.20-2.el7.ppc64.rpm
squid-sysvinit-3.5.20-2.el7.ppc64.rpm

ppc64le:
squid-debuginfo-3.5.20-2.el7.ppc64le.rpm
squid-sysvinit-3.5.20-2.el7.ppc64le.rpm

s390x:
squid-debuginfo-3.5.20-2.el7.s390x.rpm
squid-sysvinit-3.5.20-2.el7.s390x.rpm

x86_64:
squid-debuginfo-3.5.20-2.el7.x86_64.rpm
squid-sysvinit-3.5.20-2.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
squid-3.5.20-2.el7.src.rpm

x86_64:
squid-3.5.20-2.el7.x86_64.rpm
squid-debuginfo-3.5.20-2.el7.x86_64.rpm
squid-migration-script-3.5.20-2.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

x86_64:
squid-debuginfo-3.5.20-2.el7.x86_64.rpm
squid-sysvinit-3.5.20-2.el7.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2016-2569
https://access.redhat.com/security/cve/CVE-2016-2570
https://access.redhat.com/security/cve/CVE-2016-2571
https://access.redhat.com/security/cve/CVE-2016-2572
https://access.redhat.com/security/cve/CVE-2016-3948
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/7.3_Release_Notes/index.html

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2016 Red Hat, Inc.
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